1. 11 Dec, 2009 40 commits
    • Adrian Taylor's avatar
      USB: Exposing second ACM channel as tty for Nokia S60 phones. · c1479a92
      Adrian Taylor authored
      Nokia S60 phones expose two ACM channels. The first is a modem and is picked
      up by the standard AT-command interface information in the CDC-ACM driver. The
      second is marked as having a vendor-specific protocol. Normally, we don't
      expose those as ttys. (On some other devices, they may be claimed by the
      rndis_host driver and used as a network interface).
      
      But on S60 this second ACM channel is the way that third-party S60 application
      developers are expected to communicate over USB. It acts as a serial device
      at the S60 end, and so it should on Linux too.
      
      The list of devices is largely derived from:
      http://wiki.forum.nokia.com/index.php/S60_Platform_and_device_identification_codes
      http://wiki.forum.nokia.com/index.php/Nokia_USB_Product_IDs
      and includes only the S60 3rd Edition+ devices documented there.
      
      There are many devices for which the USB device ID is not documented,
      including:
          Nokia 6290
          Nokia E63
          Nokia 5630 XpressMusic
          Nokia 5730 XpressMusic
          Nokia 6710 Navigator
          Nokia 6720 classic
          Nokia 6730 Classic
          Nokia 6760 slide
          Nokia 6790 slide
          Nokia 6790 Surge
          Nokia E52
          Nokia E55
          Nokia E71x (AT&T)
          Nokia E72
          Nokia E75
          Nokia E75 US+LTA variant
          Nokia N79
          Nokia N86 8MP
          Nokia 5230 (RM-588)
          Nokia 5230 (RM-594)
          Nokia 5530 XpressMusic
          Nokia 5530 XpressMusic (china)
          Nokia 5800 XM
          Nokia N97 (RM-506)
          Nokia N97 mini
          Nokia X6
      It would be good to add those subsequently.
      Signed-off-by: default avatarAdrian Taylor <aat@realvnc.com>
      Acked-by: default avatarOliver Neukum <oliver@neukum.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      c1479a92
    • Larry Finger's avatar
      USB: Check results of dma_map_single · 85e034fd
      Larry Finger authored
      In map_urb_for_dma(), the DMA address returned by dma_map_single()
      is not checked to determine if it is legal. This lack of checking
      contributed to a problem with the libertas wireless driver
      (http://marc.info/?l=linux-wireless&m=125695331205062&w=2). The
      difficulty was not detected until the buffer was unmapped. By this time
      memory corruption had occurred.
      
      The situation is fixed by testing the returned DMA address, and
      returning -EAGAIN if the address is invalid.
      Signed-off-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      85e034fd
    • Anand Gadiyar's avatar
      USB: ehci: Allow EHCI to be built on OMAP3 · 796c8c78
      Anand Gadiyar authored
      usb: ehci: Allow EHCI to be built on OMAP3
      
      OMAP3 chips have a built-in EHCI controller.
      The recently introduced omap ehci-hcd driver missed
      out on selecting USB_ARCH_HAS_EHCI in Kconfig.
      
      Without this, the driver cannot be built.
      Signed-off-by: default avatarAnand Gadiyar <gadiyar@ti.com>
      Cc: Vikram Pandita <vikram.pandita@ti.com>
      Cc: Ajay Kumar Gupta <ajay.gupta@ti.com>
      Acked-by: default avatarFelipe Balbi <felipe.balbi@nokia.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      796c8c78
    • Alan Stern's avatar
      USB: add scatter-gather support to usbmon · b375e116
      Alan Stern authored
      This patch (as1301) adds support to usbmon for scatter-gather URBs.
      The text interface looks at only the first scatterlist element, since
      it never copies more than 32 bytes of data anyway.  The binary
      interface copies as much data as possible up to the first
      non-addressable buffer.
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      CC: Pete Zaitcev <zaitcev@redhat.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      b375e116
    • Alan Stern's avatar
      USB: EHCI: add native scatter-gather support · 40f8db8f
      Alan Stern authored
      This patch (as1300) adds native scatter-gather support to ehci-hcd.
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      40f8db8f
    • Elina Pasheva's avatar
      USB: serial: sierra driver memory reduction · 3a2b808e
      Elina Pasheva authored
      This patch deals with reducing the memory footprint for sierra driver.
      This optimization is aimed for embedded software customers.
      
      Some sierra modems can expose upwards of 7 USB interfaces, each possibly
      offering different services. In general, interfaces used for the
      exchange of wireless data require much higher throughput, hence require
      more memory (i.e. more URBs) than lower performance interfaces. URBs
      used for the IN direction are pre-allocated by the driver and this patch
      introduces a way to configure the number of IN URBs allocated on a
      per-interface basis. Interfaces with lower throughput requirements
      receive fewer URBs, thereby reducing the RAM memory consumed by the
      driver.
      
      NOTE1: This driver has always pre-allocated URBs for the IN direction.
      
      NOTE2: The number of URBs pre-allocated for the low-performance
      interfaces has already been extensively tested in previous versions of
      this driver.
      
      We also added the capability to log function calls by adding DEBUG flag.
      Please note that  this flag is commented out because this is the default
      state
      for it.
      Signed-off-by: default avatarElina Pasheva <epasheva@sierrawireless.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      3a2b808e
    • Michal Nazarewicz's avatar
      USB: Interface Association Descriptors added to CDC & RNDIS · b97503ff
      Michal Nazarewicz authored
      Without Interface Association Descriptor, the CDC serial and
      RNDIS functions did not work correctly when added to a
      composite gadget with other functions.  This is because, it
      defined two interfaces and some hosts tried to treat each
      interface separatelly.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      b97503ff
    • Michal Nazarewicz's avatar
      USB: g_mass_storage: fsg_common_init() created · 9c610213
      Michal Nazarewicz authored
      Moved code initialising fsg_common structure to fsg_common_init()
      function which is called from fsg_bind().  Moreover, changed
      reference counting mechanism: fsg_common has a reference counter
      which counts how many fsg_dev structures uses it.  When this
      reaches zero fsg_common_release() is run which unregisters
      LUN devices and frees memory.
      
      fsg_common_init() takes pointer to fsg_common structure as an
      argument.  If it is NULL function allocates storage otherwise
      uses pointed to memory (handy if fsg_common is a field of another
      structure or a static variable).
      
      fsg_common_release() will free storage only if
      free_storage_on_release is set -- it is initialised by
      fsg_common_init(): set if allocation was done, unset
      otherwise (one may overwrite it of course).
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      9c610213
    • Michal Nazarewicz's avatar
      USB: g_mass_storage: constant length buffers used · 606206c2
      Michal Nazarewicz authored
      Using version of fsg_buffhd structure with buf field being an
      array of characters with predefined size.  Since mass storage
      function does not define changing buffer size on run-time it is
      not required for the field to be a pointer to void and allocating
      space dynamically.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      606206c2
    • Michal Nazarewicz's avatar
      USB: g_mass_storage: parts of fsg_dev moved to fsg_common structure · a41ae418
      Michal Nazarewicz authored
      In the final version, many fsg_dev structures will (be able to)
      refer to a single fsg_common structure and so it is required
      to move common data to another object which can be shared.
      
      Situation where many fsg_dev structures refer single fsg_common
      structure is when a single instance of MSF is used in several
      USB configurations.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      a41ae418
    • Michal Nazarewicz's avatar
      USB: g_mass_storage: testing code from f_mass_storage.c removed · 93bcf12e
      Michal Nazarewicz authored
      Removed code that was included when CONFIG_USB_FILE_STORAGE_TEST
      was defined.  If this functionality is required one may still use
      the original File-backed Storage Gadget.  It has been agreed that
      testing functionality is not required in the composite function.
      
      Also removed fsg_suspend() and fsg_resume() which were no
      operations.
      
      Moreover, storage_common.c has been modified in such a way that
      defining certain macros skips parts of the file.  Those macros
      are:
      * FSG_NO_INTR_EP -- skips interrupt endpoint descriptors
      * FSG_NO_DEVICE_STRINGS -- skips certain strings
      * FSG_NO_OTG -- skips OTG descriptor
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      93bcf12e
    • Michal Nazarewicz's avatar
      USB: g_mass_storage: template f_mass_storage.c file created · d5e2b67a
      Michal Nazarewicz authored
      Copied file_storage.c to f_mass_storage.c which will be used as
      template for the Mass Storage composite Function.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      d5e2b67a
    • Michal Nazarewicz's avatar
      USB: g_file_storage: more code from file_storage.c moved to storage_common.c · 93f93740
      Michal Nazarewicz authored
      Since storage_common.c no longer references mod_data object
      it is now possible to include it before mod_data object is
      defined.  This makes it possible to move some defines that
      are used as default values of mod_data fields to be defined
      in storage_common.c file (where they should be set from
      the beginning).
      
      Also, show_ro(), show_file(), store_ro() and store_file()
      have been moved to storage_common.c with LUN's device's
      drvdata changed from pointing to fsg_dev to pointing to
      rw_semaphore (&fsg->filesem).
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      93f93740
    • Michal Nazarewicz's avatar
      USB: g_file_storage: per-LUN ro, removable and cdrom flags handling changed · e909ef5d
      Michal Nazarewicz authored
      removable and cdrom flag has been added to the fsg_lun structure
      removing any references to mod_data object from storage_common.c.
      
      As of read-only flag, previously it was set if a read-only
      backing file was specified (which is good) and remained set
      even after the file has been closed (which may be considered an
      issue).  Currently, the initial read-only flag is preserved so
      if it was unset each time file is opened code will try to open
      it read-write even if previous file was opened read-only.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      e909ef5d
    • Michal Nazarewicz's avatar
      USB: g_file_storage: "fsg_" prefix added to some identifiers · d6181702
      Michal Nazarewicz authored
      Prefixed some identifiers that were defined in storage_common.c file
      with "fsg_".  Not all identifiers were prefixed but the ones that are
      most likely to produce conflicts when used with other USB functions.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      d6181702
    • Michal Nazarewicz's avatar
      USB: g_file_storage: parts of file_storage.c moved to separate file · b6058d0f
      Michal Nazarewicz authored
      Moved parts of the file_storage.c file which do not reference fsg_dev
      structure to newly created storage_common.c file. dump_msg() and
      dump_cdb() have been changed to macros to remove fsg_dev reference.
      Signed-off-by: default avatarMichal Nazarewicz <m.nazarewicz@samsung.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      b6058d0f
    • Daniel Mack's avatar
      USB: Add EHCI support for MX27 and MX31 based boards · 7e8d5cd9
      Daniel Mack authored
      The Freescale MX27 and MX31 SoCs have a EHCI controller onboard.
      The controller is capable of USB on the go. This patch adds
      a driver to support all three of them.
      
      Users have to pass details about serial interface configuration in the
      platform data.
      
      The USB OTG core used here is the ARC core, so the driver should
      be renamed and probably be merged with ehci-fsl.c eventually.
      Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
      Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      7e8d5cd9
    • Alan Stern's avatar
      USB: fix a bug in the scatter-gather library · ed1db3ad
      Alan Stern authored
      This patch (as1298) fixes a bug in the new scatter-gather URB
      facility.  If an URB uses a scatterlist then it should not have the
      URB_NO_INTERRUPT flag set; otherwise the system won't be notified when
      the transfer completes.
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Acked-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      CC: Sarah Sharp <sarah.a.sharp@linux.intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      
      ed1db3ad
    • Alan Stern's avatar
      USB: add a "remove hardware" sysfs attribute · 253e0572
      Alan Stern authored
      This patch (as1297) adds a "remove" attribute to each USB device's
      directory in sysfs.  Writing to this attribute causes the device to be
      deconfigured (the same as writing 0 to the "bConfigurationValue"
      attribute) and then tells the hub driver to disable the device's
      upstream port.  The device remains locked during these activities so
      there is no possibility of it getting reconfigured in between.  The
      port will remain disabled until after the device is unplugged.
      
      The purpose of this is to provide a means for user programs to imitate
      the "Safely remove hardware" applet in Windows.  Some devices do
      expect their ports to be disabled before they are unplugged, and they
      provide visual feedback to users indicating when they can safely be
      unplugged.
      
      The security implications are minimal.  Writing to the "remove"
      attribute is no more dangerous than writing to the
      "bConfigurationValue" attribute.
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Cc: David Zeuthen <davidz@redhat.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      253e0572
    • Alan Stern's avatar
      USB: don't use a fixed DMA mapping for hub status URBs · d697cdda
      Alan Stern authored
      This patch (as1296) gets rid of the fixed DMA-buffer mapping used by
      the hub driver for its status URB.  This URB doesn't get used much --
      mainly when a device is plugged in or unplugged -- so the dynamic
      mapping overhead is minimal.  And most systems have many fewer
      external hubs than root hubs, which don't need a mapped buffer anyway.
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      d697cdda
    • Sarah Sharp's avatar
      USB: ehci: Respect IST when scheduling new split iTDs. · dccd574c
      Sarah Sharp authored
      The EHCI specification says that an EHCI host controller may cache part of
      the isochronous schedule.  The EHCI controller must advertise how much it
      caches in the schedule through the HCCPARAMS register isochronous
      scheduling threshold (IST) bits.
      
      In theory, adding new iTDs within the IST should be harmless.  The HW will
      follow the old cached linked list and miss the new iTD.  SW will notice HW
      missed the iTD and return 0 for the transfer length.
      
      However, Intel ICH9 chipsets (and some later chipsets) have issues when SW
      attempts to schedule a split transaction within the IST.  All transfers
      will cease being sent out that port, and the drivers will see isochronous
      packets complete with a length of zero.  Start of frames may or may not
      also disappear, causing the device to go into auto-suspend.  This "bus
      stall" will continue until a control or bulk transfer is queued to a
      device under that roothub.
      
      Most drivers will never cause this behavior, because they use multiple
      URBs with multiple packets to keep the bus busy.  If you limit the number
      of URBs to one, you may be able to hit this bug.
      
      Make sure the EHCI driver does not schedule full-speed transfers within
      the IST under an Intel chipset.  Make sure that when we fall behind the
      current microframe plus IST, we schedule the new transfer at the next
      periodic interval after the IST.
      
      Don't change the scheduling for new transfers, since the schedule slop will
      always be greater than the IST.  Allow high speed isochronous transfers to
      be scheduled within the IST, since this doesn't trigger the Intel chipset
      bug.
      
      Make sure that if the host caches the full frame, the EHCI driver's
      internal isochronous threshold (ehci->i_thresh) is set to
      8 microframes + 2 microframes wiggle room.  This is similar to what is done in
      the case where the host caches less than the full frame.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Clemens Ladisch <clemens@ladisch.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      dccd574c
    • Sarah Sharp's avatar
      USB: ehci: Minor constant fix for SCHEDULE_SLOP. · d7e055f1
      Sarah Sharp authored
      Change the constant SCHEDULE_SLOP to be 80 microframes, instead of 10
      frames.  It was always multiplied by 8 to convert frames to microframes.
      SCHEDULE_SLOP is only used in ehci-sched.c.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      d7e055f1
    • Sarah Sharp's avatar
      USB: xhci: Remove unused HCD statistics code. · 3c67d899
      Sarah Sharp authored
      CONFIG_USB_HCD_STAT was used in an abandoned patch to track host
      controller throughput statistics.  Since CONFIG_USB_HCD_STAT will never be
      defined, remove code that can never run.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      3c67d899
    • Sarah Sharp's avatar
      USB: xhci: Add watchdog timer for URB cancellation. · 6f5165cf
      Sarah Sharp authored
      In order to giveback a canceled URB, we must ensure that the xHCI
      hardware will not access the buffer in an URB.  We can't modify the
      buffer pointers on endpoint rings without issuing and waiting for a stop
      endpoint command.  Since URBs can be canceled in interrupt context, we
      can't wait on that command.  The old code trusted that the host
      controller would respond to the command, and would giveback the URBs in
      the event handler.  If the hardware never responds to the stop endpoint
      command, the URBs will never be completed, and we might hang the USB
      subsystem.
      
      Implement a watchdog timer that is spawned whenever a stop endpoint
      command is queued.  If a stop endpoint command event is found on the
      event ring during an interrupt, we need to stop the watchdog timer with
      del_timer().  Since del_timer() can fail if the timer is running and
      waiting on the xHCI lock, we need a way to signal to the timer that
      everything is fine and it should exit.  If we simply clear
      EP_HALT_PENDING, a new stop endpoint command could sneak in and set it
      before the watchdog timer can grab the lock.
      
      Instead we use a combination of the EP_HALT_PENDING flag and a counter
      for the number of pending stop endpoint commands
      (xhci_virt_ep->stop_cmds_pending).  If we need to cancel the watchdog
      timer and del_timer() succeeds, we decrement the number of pending stop
      endpoint commands.  If del_timer() fails, we leave the number of pending
      stop endpoint commands alone.  In either case, we clear the
      EP_HALT_PENDING flag.
      
      The timer will decrement the number of pending stop endpoint commands
      once it obtains the lock.  If the timer is the tail end of the last stop
      endpoint command (xhci_virt_ep->stop_cmds_pending == 0), and the
      endpoint's command is still pending (EP_HALT_PENDING is set), we assume
      the host is dying.  The watchdog timer will set XHCI_STATE_DYING, try to
      halt the xHCI host, and give back all pending URBs.
      
      Various other places in the driver need to check whether the xHCI host
      is dying.  If the interrupt handler ever notices, it should immediately
      stop processing events.  The URB enqueue function should also return
      -ESHUTDOWN.  The URB dequeue function should simply return the value
      of usb_hcd_check_unlink_urb() and the watchdog timer will take care of
      giving the URB back.  When a device is disconnected, the xHCI hardware
      structures should be freed without issuing a disable slot command (since
      the hardware probably won't respond to it anyway).  The debugging
      polling loop should stop polling if the host is dying.
      
      When a device is disconnected, any pending watchdog timers are killed
      with del_timer_sync().  It must be synchronous so that the watchdog
      timer doesn't attempt to access the freed endpoint structures.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      6f5165cf
    • Sarah Sharp's avatar
      USB: xhci: Re-purpose xhci_quiesce(). · 4f0f0bae
      Sarah Sharp authored
      xhci_quiesce() is basically a no-op right now.  It's only called if
      HC_IS_RUNNING() is true, and the body of the function consists of a
      BUG_ON if HC_IS_RUNNING() is false.  For the new xHCI watchdog timer, we
      need a new function that clears the xHCI running bit in the command
      register, but doesn't wait for the halt status to show up in the status
      register.  Re-purpose xhci_quiesce() to do that.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      4f0f0bae
    • Sarah Sharp's avatar
      USB: xhci: Handle URB cancel, complete and resubmit race. · 678539cf
      Sarah Sharp authored
      In the old code, there was a race condition between the stop endpoint
      command and the URB submission process.  When the stop endpoint command is
      handled by the event handler, the endpoint ring is assumed to be stopped.
      When a stop endpoint command is queued, URB submissions are to not ring
      the doorbell.  The old code would check the number of pending URBs to be
      canceled, and would not ring the doorbell if it was non-zero.
      
      However, the following race condition could occur with the old code:
      
      1. Cancel an URB, add it to the list of URBs to be canceled, queue the stop
         endpoint command, and increment ep->cancels_pending to 1.
      2. The URB finishes on the HW, and an event is enqueued to the event ring
         (at the same time as 1).
      3. The stop endpoint command finishes, and the endpoint is halted.  An
         event is queued to the event ring.
      4. The event handler sees the finished URB, notices it was to be
         canceled, decrements ep->cancels_pending to 0, and removes it from the to
         be canceled list.
      5. The event handler drops the lock and gives back the URB.  The
         completion handler requeues the URB (or a different driver enqueues a new
         URB).  This causes the endpoint's doorbell to be rung, since
         ep->cancels_pending == 0.  The endpoint is now running.
      6. A second URB is canceled, and it's added to the canceled list.
         Since ep->cancels_pending == 0, a new stop endpoint command is queued, and
         ep->cancels_pending is incremented to 1.
      7. The event handler then sees the completed stop endpoint command.  The
         handler assumes the endpoint is stopped, but it isn't.  It attempts to
         move the dequeue pointer or change TDs to cancel the second URB, while the
         hardware is actively accessing the endpoint ring.
      
      To eliminate this race condition, a new endpoint state bit is introduced,
      EP_HALT_PENDING.  When this bit is set, a stop endpoint command has been
      queued, and the command handler has not begun to process the URB
      cancellation list yet.  The endpoint doorbell should not be rung when this
      is set.  Set this when a stop endpoint command is queued, clear it when
      the handler for that command runs, and check if it's set before ringing a
      doorbell.  ep->cancels_pending is eliminated, because it is no longer
      used.
      
      Make sure to ring the doorbell for an endpoint when the stop endpoint
      command handler runs, even if the canceled URB list is empty.  All
      canceled URBs could have completed and new URBs could have been enqueued
      without the doorbell being rung before the command was handled.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      678539cf
    • Oliver Neukum's avatar
      USB: improved error handling in usb_port_suspend() · 0c487206
      Oliver Neukum authored
      usb: better error handling in usb_port_suspend
      
      - disable remote wakeup only if it was enabled
      - refuse to autosuspend if remote wakeup fails to be enabled
      Signed-off-by: default avatarOliver Neukum <oliver@neukum.org>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      0c487206
    • Felipe Balbi's avatar
      USB: host: ehci: introduce omap ehci-hcd driver · 54ab2b02
      Felipe Balbi authored
      this driver has been sitting in linux-omap tree for quite
      some time. It adds support for omap's ehci controller.
      Signed-off-by: default avatarFelipe Balbi <felipe.balbi@nokia.com>
      Signed-off-by: default avatarVikram Pandita <vikram.pandita@ti.com>
      Signed-off-by: default avatarAjay Kumar Gupta <ajay.gupta@ti.com>
      Signed-off-by: default avatarAnand Gadiyar <gadiyar@ti.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      54ab2b02
    • Daniel Mack's avatar
      USB OTG: Add generic driver for ULPI OTG transceiver · 2d57a95f
      Daniel Mack authored
      This adds a minimal generic driver for ULPI connected transceivers,
      using the OTG framework functions recently introduced.
      
      The driver got a table to match the ULPI chips, which currently only has
      one entry for NXP's ISP 1504 transceiver.
      Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
      Cc: Heikki Krogerus <ext-heikki.krogerus@nokia.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Cc: Sascha Hauer <s.hauer@pengutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      2d57a95f
    • Daniel Mack's avatar
      USB OTG: add support for ulpi connected external transceivers · 91c8a5a9
      Daniel Mack authored
      This adds support for OTG transceivers directly connected to the ULPI
      interface. In particular, the following details are added
      
      - a struct for low level io functions (read/write)
      - a priv field to be used as 'viewport' by low level access functions
      - an (*init) and (*shutdown) callbacks, along with static inline helpers
      - a (*set_vbus) callback to switch the port power on and off
      - a flags field for per-transceiver settings
      - some defines for the flags bitmask to configure platform specific
        details
      Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
      Cc: Heikki Krogerus <ext-heikki.krogerus@nokia.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      91c8a5a9
    • David Vrabel's avatar
      USB: wusb: add wusb_phy_rate sysfs file to host controllers · c3f22d92
      David Vrabel authored
      Add the wusb_phy_rate sysfs file to Wireless USB host controllers.  This
      sets the maximum PHY rate that will be used for all connected devices.
      Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      c3f22d92
    • David Vrabel's avatar
      usb: whci-hcd: decode more QHead fields in the debug files · d19fc291
      David Vrabel authored
      Print ep number, direction and type; and current window in asl and pzl
      debugfs files.
      Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      d19fc291
    • Oliver Neukum's avatar
      USB: usbtmc: minor formatting cleanups · dca8cd04
      Oliver Neukum authored
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      dca8cd04
    • Hong Xu's avatar
      USB: modifications for at91sam9g10 · 23f6d914
      Hong Xu authored
      Modify both host and gadget USB drivers for at91sam9g10.
      This add a clock management equivalent to at91sam9261 on usb drivers.
      It also add the way of handling gadget pull-ups (like the at91sam9261).
      Signed-off-by: default avatarHong Xu <hong.xu@atmel.com>
      Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
      23f6d914
    • Laurent Pinchart's avatar
      USB audio gadget: handle endpoint control requests at the function level · 0ad72524
      Laurent Pinchart authored
      Now that control requests targeted at an endpoint can be handled at the
      function level, move the UAC-specific control request handling code from
      the audio gadget driver to the audio function driver.
      Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      0ad72524
    • Laurent Pinchart's avatar
      USB gadget: Handle endpoint requests at the function level · 5242658d
      Laurent Pinchart authored
      Control requests targeted at an endpoint (that is sent to EP0 but
      specifying the target endpoint address in wIndex) are dispatched to the
      current configuration's setup callback, requiring all gadget drivers to
      dispatch the requests to the correct function driver.
      
      To avoid this, record which endpoints are used by each function in the
      composite driver SET CONFIGURATION handler and dispatch requests
      targeted at endpoints to the correct function.
      Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
      Cc: David Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      5242658d
    • Julia Lawall's avatar
      USB: skeleton: Correct use of ! and & · 4de84057
      Julia Lawall authored
      Correct priority problem in the use of ! and &.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @@ expression E; constant C; @@
      - !E & C
      + !(E & C)
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      4de84057
    • David Vrabel's avatar
      USB: whci-hcd: fix type and format warnings in sg code · f0ad073f
      David Vrabel authored
      Fix type and format warning in the new sg code.  Remove the very chatty
      debug messages that were left in by mistake and use min_t() as required
      (no one seems to agree on a type for buffer sizes).
      Reported-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
      Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      f0ad073f
    • David Vrabel's avatar
      USB: allow interrupt transfers to WUSB devices · 8e08b976
      David Vrabel authored
      Check urb->interval on interrupt transfers and allow those with valid
      values (6 <= interval <= 16).
      Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      8e08b976
    • David Vrabel's avatar
      USB: whci-hcd: support urbs with scatter-gather lists · 294a39e7
      David Vrabel authored
      Support urbs with scatter-gather lists by trying to fit sg list elements
      into page lists in one or more qTDs.  qTDs must end on a wMaxPacketSize
      boundary so if this isn't possible the urb's sg list must be copied into
      bounce buffers.
      Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      294a39e7